CN114985938B - Method for preparing aluminum alloy super-hydrophobic surface by flat-top laser shot blasting - Google Patents
Method for preparing aluminum alloy super-hydrophobic surface by flat-top laser shot blasting Download PDFInfo
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- CN114985938B CN114985938B CN202210641002.3A CN202210641002A CN114985938B CN 114985938 B CN114985938 B CN 114985938B CN 202210641002 A CN202210641002 A CN 202210641002A CN 114985938 B CN114985938 B CN 114985938B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/352—Working by laser beam, e.g. welding, cutting or boring for surface treatment
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/14—Working by laser beam, e.g. welding, cutting or boring using a fluid stream, e.g. a jet of gas, in conjunction with the laser beam; Nozzles therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
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Abstract
The invention provides a method for preparing an aluminum alloy super-hydrophobic surface by flat-top laser shot blasting, which comprises the following steps: pretreating the surface of the aluminum alloy; uniformly coating a nano-scale carbon powder layer on the surface of the pretreated aluminum alloy; adopting square light spot flat-top nanosecond pulse laser, wherein the carbon powder layer is used as an absorption layer, carrying out unconstrained layer shot blasting treatment on the surface of the aluminum alloy, and keeping the light beam vertical to the surface of the aluminum alloy all the time; and removing residual carbon powder after shot blasting, and reducing the surface energy of the material through low-temperature heat treatment to obtain the super-hydrophobic aluminum alloy surface with the micro-nano multilevel structure. The method improves the content of carbon elements near the surface layer of the aluminum alloy material, and can effectively improve the hardness and the wear resistance of the prepared hydrophobic surface.
Description
Technical Field
The invention relates to the field of preparation of aluminum alloy super-hydrophobic surfaces, in particular to a method for preparing an aluminum alloy super-hydrophobic surface by flat-top laser shot blasting.
Background
The aviation aluminum alloy has the advantages of light weight, high strength, good toughness, excellent mechanical property and processability, and wide application in the fields of aviation and aerospace. The surface of the aviation aluminum alloy has high wettability, so that water drops are generated to adhere and condense in a low-temperature and humid working environment, the surface of the material is easy to corrode and freeze, and the service life and the service performance of an aluminum alloy member are adversely affected. A large number of researches show that the super-hydrophobic structure constructed on the surface of the aluminum alloy in the aviation can effectively slow down the corrosion and icing of the surface of the material, so that the preparation of the super-hydrophobic surface of the aluminum alloy has important significance in the fields of aviation and aerospace.
At present, methods for preparing a super-hydrophobic surface by an aluminum alloy material are various, such as an electrochemical method, an electrochemical micro-processing method, a chemical etching method, an electroplating method, a sol-gel method and the like, but the preparation methods have many defects, such as complex process and low efficiency, and some methods need special equipment and harsh preparation environment, so that the preparation cost of the super-hydrophobic surface is high, the prepared hydrophobic texture has the problems of low strength, poor mechanical stability, reduced strength of a prepared matrix material and the like, and the application of the super-hydrophobic surface preparation process to aviation aluminum alloy components with complex and severe service environments is greatly limited.
The laser shot blasting technology is used as a novel surface modification strengthening process, beneficial changes are made to the microstructure of the material close to the surface layer by using plasma shock waves generated by irradiating the surface of the material with laser, and high-amplitude residual compressive stress is induced in the matrix, so that the mechanical property of the material is effectively improved, and the laser shot blasting technology has the advantages of high strengthening efficiency and strong controllability. The porous micro-nano multilevel structure can be generated on the surface of the aviation aluminum alloy by utilizing the thermal coupling effect generated by laser shot blasting, and the super-hydrophobicity is given to the surface of the aluminum alloy after the surface energy is reduced, so that the method is an important super-hydrophobic surface preparation method. However, in the current process for preparing the aluminum alloy super-hydrophobic surface by laser peening, the round Gaussian spot without an absorption layer is adopted for peening, and the peening is influenced by the round Gaussian spot and the lap joint rate, so that the prepared super-hydrophobic macroscopic surface has certain fluctuation, the rolling resistance of liquid drops is increased, the liquid drops are not favorable for sliding away from the surface of the material, and the capability of improving the strength of the prepared hydrophobic texture is limited.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a method for preparing an aluminum alloy super-hydrophobic surface by flat-top laser shot blasting, which is characterized in that on the basis of the existing process for preparing the super-hydrophobic surface by laser shot blasting, a square spot flat-top laser is selected, and unconstrained layer shot blasting is carried out by taking a carbon powder layer as an absorption layer; on the other hand, the thermal coupling effect generated by laser shot blasting enables the surface of the aluminum alloy to generate a porous micro-nano multilevel structure with a hydrophobic effect, and meanwhile, the microstructure of the matrix material is effectively strengthened, and the mechanical property is improved. The square light spot flat-top pulse laser is used as a light source for laser impact, the fluctuation appearance generated by round light spot Gaussian laser shot blasting is effectively changed, the surface flatness is improved, the sliding resistance of liquid drops can be effectively reduced, and the super-hydrophobic effect of the prepared surface is further improved. Therefore, the carbon powder layer is used as the absorption layer to carry out flat-top pulse laser shot blasting on the square light spots of the unconstrained layer, the preparation of the super-hydrophobic surface on the aluminum alloy material substrate is efficiently completed, the reinforcement of the substrate material is realized, the super-hydrophobic effect and the surface strength are also effectively improved, and the mechanical wear resistance of the super-hydrophobic surface is enhanced.
The present invention achieves the above-described object by the following means.
A method for preparing an aluminum alloy super-hydrophobic surface by flat-top laser shot blasting comprises the following steps:
pretreating the surface of the aluminum alloy;
uniformly coating a nano-scale carbon powder layer on the surface of the pretreated aluminum alloy;
adopting square light spot flat-top nanosecond pulse laser, taking the carbon powder layer as an absorption layer, carrying out unconstrained layer shot blasting treatment on the surface of the aluminum alloy, and keeping a light beam vertical to the surface of the aluminum alloy all the time;
and removing residual carbon powder after shot blasting, and reducing the surface energy of the material through low-temperature heat treatment to obtain the super-hydrophobic aluminum alloy surface with the micro-nano multilevel structure.
Further, the pre-processing comprises: and (3) gradually grinding and polishing the surface of the aluminum alloy to enable the roughness value of the surface to be less than or equal to 50 microns, and ultrasonically cleaning and drying the treated surface by adopting deionized water.
Further, the nano-scale carbon powder layer is a mixture of nano-carbon powder and epoxy resin glue, the diameter range of the nano-carbon powder is 50 nm-300 nm, and the thickness of the nano-scale carbon powder layer is 100 mu m-500 mu m.
Further, the square light spot flat-top nanosecond pulse laser is obtained by passing a round flat-top nanosecond pulse laser through a beam shaper.
Further, a laser for generating square spot flat-top nanosecond pulse laser is Nd: YAG solid laser, the laser processing parameters are as follows: the wavelength is 1064nm, the laser energy is 1J-15J, the repetition frequency is 1 Hz-5 Hz, the pulse width is 10 ns-20 ns, and the side length of a square light spot is less than or equal to 5mm.
Further, the method for reducing the surface energy of the material by low-temperature heat treatment comprises the following steps: and (3) placing the aluminum alloy material subjected to shot blasting treatment in a vacuum drying oven at the temperature of 80-150 ℃ for treatment for 1-10 h.
The invention has the beneficial effects that:
1. the method for preparing the aluminum alloy super-hydrophobic surface by flat-top laser shot blasting selects the square light spot flat-top pulse laser, and compared with the traditional round light spot Gaussian pulse laser, the stress wave is mainly the plane compression wave which is longitudinally transmitted in the shot blasting process, and the energy proportion occupied by the surface transverse wave is lower.
2. According to the method for preparing the super-hydrophobic surface of the aluminum alloy by the flat-top laser shot blasting, the carbon powder layer is used as an absorption layer during the laser shot blasting, when the high-power-density strong pulse laser irradiates the surface of the aluminum alloy plate, the carbon powder absorbs partial energy to rapidly ionize and gasify, the laser energy is continuously absorbed to generate high-pressure shock waves, so that the melted carbon powder and the remelting material on the surface layer of the aluminum alloy are stirred and modulated, the carbon content of the near-surface layer of the aluminum alloy is increased, the hardness of the hydrophobic micro-nano texture is effectively improved, and the prepared super-hydrophobic surface has better wear resistance; meanwhile, under the action of the laser shot blasting force effect, the metal material surface layer forms higher dislocation density, crystal grains are effectively refined, and the frictional wear performance and the mechanical stability of the texture surface are improved.
3. The method for preparing the aluminum alloy super-hydrophobic surface by flat-top laser shot blasting reduces the surface energy of the surface with the micro-nano multilevel structure by using a low-temperature heat treatment process, and is clean and pollution-free. The low-temperature heat treatment enables the surface of the sample and oxygen in the air to have a sufficient effect, the components of the surface of the micro-nano multilevel structure are regulated, the adsorption capacity of the surface of the aluminum alloy on organic matters in the air is remarkably improved, a large amount of carbon elements are introduced into the micro-nano multilevel texture in the laser shot blasting process, the nonpolar functional groups on the surface of the material are greatly increased, the surface energy is effectively reduced, and the preparation of the fluorine-free aluminum alloy super-hydrophobic surface is realized.
4. The method for preparing the aluminum alloy super-hydrophobic surface by flat-top laser shot blasting has the advantages of simplicity and convenience in operation, low cost and the like, is easy to realize large-scale industrial production, remarkably improves the wear resistance and mechanical stability of the micro-nano multilevel texture of the super-hydrophobic surface, improves the strength of an aluminum alloy matrix material to a certain extent, is better suitable for complex and severe environments in the field of aerospace, and has a wider industrial application prospect.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained from the drawings without creative efforts.
FIG. 1 is a schematic diagram of a method for preparing an aluminum alloy superhydrophobic surface by flat-top laser peening.
FIG. 2 is a diagram illustrating an actual effect of the super-hydrophobic surface topography prepared in the first embodiment of the present invention.
FIG. 3 is a graph comparing contact angles of drops of superhydrophobic surfaces prepared by various embodiments of the invention.
FIG. 4 is a comparative microhardness image of a superhydrophobic surface prepared by various embodiments of the present invention.
Fig. 5 is a graph showing the change of the contact angle of the liquid drop on the superhydrophobic surface prepared in the third embodiment of the invention after ultrasonic vibration treatment for different durations.
Detailed Description
The invention will be further described with reference to the following figures and specific examples, without limiting the scope of the invention thereto.
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative and intended to explain the present invention and should not be construed as limiting the present invention.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "axial," "radial," "vertical," "horizontal," "inner," "outer," and the like are used in the orientations and positional relationships indicated in the figures, which are based on the orientation or positional relationship shown in the figures, and are used for convenience in describing the present invention and to simplify the description, but are not intended to indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus are not to be construed as limiting the present invention. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood according to specific situations by those of ordinary skill in the art.
As shown in FIG. 1, the method for preparing the aluminum alloy super-hydrophobic surface by flat-top laser peening comprises the following steps:
gradually grinding and polishing the surface of the aluminum alloy to enable the surface roughness value to be less than or equal to 50 microns, and ultrasonically cleaning and drying the treated surface by adopting deionized water;
mixing nano carbon powder with the diameter range of 50 nm-300 nm with epoxy resin glue and coating the mixture on the surface of an aluminum alloy plate to form a nano carbon powder layer with the thickness of 100 mu m-500 mu m on the surface of the aluminum alloy plate;
adopting a square light spot flat-top nanosecond pulse laser, selecting reasonable parameters and paths, and using the carbon powder layer as an absorption layer during laser shot blasting to perform unconstrained layer shot blasting treatment on the surface of the aluminum alloy sample, wherein the light beam is always vertical to the surface of the plate;
and after the shot blasting is finished, removing residual carbon powder on the surface of the aluminum alloy by using ultrasonic cleaning, and then placing the plate subjected to the shot blasting treatment in a vacuum drying oven at the constant temperature of 80-150 ℃ for low-temperature treatment for 1-10 h to reduce the surface energy of the material and finish the preparation of the super-hydrophobic aluminum alloy surface with the micro-nano multilevel structure.
According to the method for preparing the aluminum alloy superhydrophobic surface by the flat-top laser shot blasting, round spot flat-top nanosecond pulse laser is converted into square spot flat-top nanosecond pulse laser through the beam shaper, the nano carbon powder layer is used as an absorption layer, unconstrained layer laser shot blasting is performed on the surface of the aluminum alloy, the surface energy of the material is reduced by combining a low-temperature heat treatment process, and the aluminum alloy surface is endowed with superhydrophobicity. The shot blasting is carried out by using the square spot flat-top pulse laser, so that the residual compressive stress generated by the laser shot blasting is favorably regulated and controlled, the stress distribution is more uniform, and the service life of the material can be effectively prolonged; the nanoscale carbon powder is used as an absorption layer during laser shot blasting, the absorption rate of laser energy is increased, high-strength plasma shock waves are generated, the melted carbon powder and an aluminum alloy surface remelting substance are stirred while the materials are subjected to impact strengthening, the content of carbon elements on the surface layer of the aluminum alloy is greatly improved, the strength and hardness of the prepared multistage micro-nano structure are further improved, and the prepared superhydrophobic surface has high matrix wear resistance and mechanical stability; the macro morphology of the super-hydrophobic surface prepared by laser peening can be regulated and controlled by optimally setting parameters such as the size and shape of a laser spot, laser energy, the lap joint rate, the peening path and the like, so that the prepared surface is relatively flat, the sliding resistance of liquid drops can be effectively reduced, and the rolling angle is reduced; according to the invention, a large amount of nonpolar functional groups are introduced to the surface of the aluminum alloy material in a low-temperature heat treatment mode, so that the reduction of the surface energy of the prepared micro-nano multilevel structure is realized, and the preparation of the aluminum alloy super-hydrophobic surface is realized in a fluorine-free adding mode.
In order to make the objects, technical solutions and advantages of the present invention clearer, 2024-T351 aviation aluminum alloy is selected as a research object, and the present invention is described in detail with reference to specific embodiments.
The first embodiment is as follows:
the method for preparing the aluminum alloy super-hydrophobic surface by the flat-top laser peening comprises the following steps:
(1) Sanding the surface of 2024-T351 aviation aluminum alloy by using sand paper with grain diameters of 400#, 800#, 1000#, 1500# and 2000#, polishing on a polishing machine to enable the surface of the aluminum alloy to reach a mirror surface (Ra is less than or equal to 50 mu m), then carrying out ultrasonic cleaning on the surface of a sample in absolute ethyl alcohol solution for 5min, and drying in a vacuum drying oven for later use;
(2) Mixing carbon powder with the diameter of 50nm and epoxy resin glue and coating the mixture on the surface of an aluminum alloy plate to form a nano carbon powder layer with the thickness of 100 mu m on the surface of the aluminum alloy plate;
(3) A Nd-YAG high-repetition-frequency large-energy nanosecond pulse laser is selected, a beam shaper is adjusted to convert round-spot flat-top pulse nanosecond laser into square-spot flat-top pulse nanosecond laser, and the specific parameters of laser shot blasting are as follows: the wavelength is 1064nm, the laser frequency is 1Hz, the pulse width is 20ns, the overlapping rate of light spots is 0 percent, the diameter of the light spots is 3mm, and the laser energy is 5J;
(4) And after laser shot blasting is finished, removing residual carbon powder on the surface of the aluminum alloy by using ultrasonic cleaning, placing the aviation aluminum alloy sample in a drying box at the temperature of 100 ℃ for low-temperature heat treatment for 5 hours, introducing a large amount of nonpolar functional groups on the surface of the aluminum alloy material, reducing the surface energy of the aluminum alloy material, and finishing the preparation of the aluminum alloy superhydrophobic surface.
The shape of the aviation aluminum alloy super-hydrophobic surface prepared in the first embodiment is as shown in fig. 2, and compared with an aluminum alloy super-hydrophobic surface prepared by a round spot Gaussian pulse nanosecond laser, the macroscopic surface of a sample is relatively flat, and meanwhile, the aviation aluminum alloy super-hydrophobic surface has an excellent micro-nano multi-level structure shape, so that the hydrophobic effect of the prepared surface is improved; as shown in fig. 3, the surface of the sample prepared in example one has excellent superhydrophobicity, the sliding resistance of the liquid drop is small, the contact angle of the liquid drop is 162 °, and the rolling angle is 4 °; as shown in FIG. 4, under the thermal action generated by laser shot blasting, the carbon element on the surface layer of the aviation aluminum alloy is greatly increased, the microhardness of the prepared aviation aluminum alloy super-hydrophobic surface is greatly improved to 191HV, and is improved by 46.9% compared with the average hardness value of 130HV on the surface of an untreated sample, so that the method has important significance in improving the wear resistance of the prepared super-hydrophobic surface.
Example two
On the basis of the first embodiment, the diameter of the carbon powder in the second embodiment reaches 300nm, the thickness of the carbon powder absorption layer is 500 μm, and the laser shot energy is set to be 13J.
As shown in FIG. 3, the contact angle of the liquid drop of the super-hydrophobic surface obtained in the second example is 159 degrees, the rolling angle is 5 degrees, and the excellent super-hydrophobicity of the surface of the aviation aluminum alloy is also realized. In the second embodiment, larger carbon powder particles and a thicker carbon powder absorption layer are adopted, the laser shot blasting energy is also improved, the strengthening effect is also effectively improved on a deeper influence layer generated on the surface of the aviation aluminum alloy, as shown in fig. 4, the superhydrophobic surface microhardness value of the aviation aluminum alloy prepared in the second embodiment is 211HV, the average hardness of the superhydrophobic surface is improved by 62.3% compared with 130HV on the surface of an untreated sample base material, the average hardness of the superhydrophobic surface is improved by 10.5% compared with HV191 on the surface of a sample after treatment in the first embodiment, more carbon powder and larger laser energy enable the carbon element and remelted substances on the surface of the aluminum alloy to be stirred more fully, and the hardness and the mechanical stability of the superhydrophobic surface are further improved.
EXAMPLE III
On the basis of the first embodiment, the diameter of the carbon powder in the third embodiment is 150nm, the thickness of the carbon powder absorption layer is 300 μm, and the laser shot energy is set to be 8J.
The contact angle of a liquid drop on the surface of the sample treated in the third embodiment is 164 degrees, the rolling angle is 4 degrees, the surface of the prepared aviation aluminum alloy sample also has excellent superhydrophobic performance, the microscopic hardness value of the superhydrophobic surface of the aviation aluminum alloy prepared in the third embodiment is 201HV, and the average hardness of the superhydrophobic surface of the aviation aluminum alloy is 54.6% higher than that of the surface of the matrix material of an untreated sample, namely 130 HV. The sample prepared in the third embodiment is placed on an ultrasonic vibration table to perform a hydrophobic surface stability characterization experiment, as shown in fig. 5, the contact angle of the liquid drop on the prepared superhydrophobic surface is reduced with the increase of vibration time, but the contact angle is still maintained above 155 degrees after 5 hours, and the prepared superhydrophobic surface of the aviation aluminum alloy has high mechanical stability.
It should be understood that although the present description has been described in terms of various embodiments, not every embodiment includes only a single embodiment, and such description is for clarity purposes only, and those skilled in the art will recognize that the embodiments described herein may be combined as suitable to form other embodiments, as will be appreciated by those skilled in the art.
The above-listed detailed description is only a specific description of a possible embodiment of the present invention, and they are not intended to limit the scope of the present invention, and equivalent embodiments or modifications made without departing from the technical spirit of the present invention should be included in the scope of the present invention.
Claims (6)
1. A method for preparing an aluminum alloy super-hydrophobic surface by flat-top laser shot blasting is characterized by comprising the following steps:
pretreating the surface of the aluminum alloy;
uniformly coating a nano-scale carbon powder layer on the surface of the pretreated aluminum alloy;
adopting square light spot flat-top nanosecond pulse laser, wherein the carbon powder layer is used as an absorption layer, carrying out unconstrained layer shot blasting treatment on the surface of the aluminum alloy, and keeping the light beam vertical to the surface of the aluminum alloy all the time; laser irradiation increases the absorptivity of laser energy on the carbon powder layer, a part of carbon powder absorbs the laser energy and then is converted into plasma, shock waves generated by the rapid expansion of the plasma enable the heated and melted carbon powder and the remelting material on the surface of the aluminum alloy to be stirred and modulated, and the carbon powder is used for improving the content of carbon elements near the surface layer of the aluminum alloy material;
and removing residual carbon powder after shot blasting, and reducing the surface energy of the material through low-temperature heat treatment to obtain the super-hydrophobic aluminum alloy surface with the micro-nano multilevel structure.
2. The method for preparing the aluminum alloy superhydrophobic surface by the flat-top laser peening as claimed in claim 1, wherein the pretreatment comprises: and step-by-step grinding and polishing are carried out on the surface of the aluminum alloy to enable the surface roughness value to be less than or equal to 50 mu m, and the treated surface is subjected to ultrasonic cleaning and drying by deionized water.
3. The method for preparing the aluminum alloy super-hydrophobic surface through flat-top laser peening according to claim 1, characterized in that the nano-scale carbon powder layer is a mixture of nano-carbon powder and epoxy resin glue, the diameter range of the nano-carbon powder is 50 nm-300 nm, and the thickness of the nano-scale carbon powder layer is 100 mu m-500 mu m.
4. The method for preparing the aluminum alloy superhydrophobic surface through the flat-top laser peening according to claim 1, wherein the square-spot flat-top nanosecond pulse laser is obtained by passing a round flat-top nanosecond pulse laser through a beam shaper.
5. The method for preparing the aluminum alloy superhydrophobic surface by flat-top laser peening according to claim 1, wherein a laser generating square spot flat-top nanosecond pulse laser is Nd: YAG solid laser, the laser processing parameters are as follows: the wavelength is 1064nm, the laser energy is 1J-15J, the repetition frequency is 1 Hz-5 Hz, the pulse width is 10 ns-20 ns, and the side length of the square light spot is less than or equal to 5mm.
6. The method for preparing the aluminum alloy super-hydrophobic surface by the flat-top laser peening according to claim 1, wherein the method for reducing the surface energy of the material by the low-temperature heat treatment is as follows: and (3) placing the aluminum alloy material subjected to shot blasting treatment in a vacuum drying oven at the temperature of 80-150 ℃ for treatment for 1-10 h.
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| CN202210641002.3A CN114985938B (en) | 2022-06-08 | 2022-06-08 | Method for preparing aluminum alloy super-hydrophobic surface by flat-top laser shot blasting |
| GB2313401.8A GB2623639A (en) | 2022-06-08 | 2022-07-18 | Method for preparing aluminum alloy super-hydrophobic surface by flat-top laser peening |
| US18/010,839 US11839934B1 (en) | 2022-06-08 | 2022-07-18 | Method for preparing super-hydrophobic aluminum alloy surface through flat-topped laser peening |
| PCT/CN2022/106171 WO2023236314A1 (en) | 2022-06-08 | 2022-07-18 | Method for preparing aluminum alloy super-hydrophobic surface by flat-top laser peening |
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| CN114985938A (en) | 2022-09-02 |
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